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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39e09054e68d580e84a9b302fdc55e37048f1131be48f7fe2e92ba3733aa4ac' 
  AND token = 'KZo3hos+Ru/nFne4fWTXPnZ1jGEltyZ1Ec1eFvjOsR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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