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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90a2420501e0501b6a9ef5e03c56a248da0ed928615b1e00b276267b5181f6f' 
  AND token = '/Ql1Ye76PfnpdGlokehy6LynY/mw3sm2N9NzTt2gF4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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