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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9cb5c712e145fcdcb5f4da5a8b0f1ad5b8574b4adeaf71b95a8bfae871582a' 
  AND token = 'vJ6qg1rKzWqar13TBjLfP99J1KF141s2CwYTmoEBO3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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