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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc9ca026c44abd65902c48af51a04e98fdd5a93f086e1503ac5d7f3f0f9d1b8' 
  AND token = '2+HVPLVWQrYJDNon+htI9qWjZ+WRNfA8ngCO/dQgP50=' 
  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"
    }
  }
}