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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3f6c5e646e5b20205bd96c65beef550def52e21258aa79e0aa1e8fba84e65b' 
  AND token = '/ZXmYZA8Zt7OAw82l3UXH+okOp0H9LP1EWgadsT9kcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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