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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9008fe073db90fcc3e6db2f895f38492278887dec6ed8c16ee715aa20626f160' 
  AND token = 'b3ITknwI8VgBRz+fK2c5JSGYEJJtMfo2kdBaphU6nSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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