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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c096c2a791b76574dfe93ea3bd05ca06c5dfe8ff46b8f5df0647a9700f50a536' 
  AND token = 'gKfp0ZYyVluVarWdxDcSs+jyJnvXCQD3joDdrBMGIbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}