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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7549b5091e3041faba2f1ffbb0340fb8fce48d68b8ab541042b163a8d9f33efc' 
  AND token = 'J7A/ySGLAfJdP5H4mw1g82XYmQeXlCiuXAaVd89jXsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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