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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1d7e49cae22adce2b11261664f4f0f5bb5a5d8d868c6498c14ddc6d2e918ac' 
  AND token = 'Yf5VXhkl3+PzllsFHn1MRJYI7f8OEPeAqLsDrgc6S2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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