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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4652e3d2e130eb1f42425b6e92ed31843e3ed213e4b6758a57708fe210ea8d' 
  AND token = 'OWVK5dzJI2sLIKy9eFSO4DkUrpzYikVx6OdpUOMOS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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