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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa109a6e62cffc0a5cca09c39193a4d22fbf638a538e32db121f59f2a5ff0222' 
  AND token = '/pnLxQL/PESYrXyvumyttc2hWn9tIrBI0WNuchZJhKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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