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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712d581b11e74513f0a63ae90a690901988c10c736603cd4faa37a1898c0f69f' 
  AND token = 'Gr11Q89HQeW28yk4mjb8q9OZZrh9QxBkmr3s8YEVX1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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