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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bef423fa0db81e73b6e25b7b086f73c90fd4c266905e8677090399b302f74d5' 
  AND token = 'Gk+Q5rX2p7wto0hD7ejH09uEb74BINNRmP00kTLCUfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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