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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3150bb3e015976b597ca3253aabd03b4da9987602b282c3d69293c1fa299ba4a' 
  AND token = 'wepfwsdAQn4k2Z8F/N/TqFOuB5k8Ehzv4oi3VLf5fWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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