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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1979976a91c4c9d596e839747a2eb8a9be3517a5163c64eff7ba2d218a9767' 
  AND token = 'e2QnBlxnekOeZhsi8fj5PQvX1ibMq8MxsLcYeE3T88Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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