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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0cc0f443ffe32af4bff7667312ff006d669435bf6e8d6e138f6b061788f5f3' 
  AND token = 'i0BFRVt9dhPYkYigAC79pWyIF9iV3m0dJQfj9neItKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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