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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca0aadc8d929f0e278aa9b4624ab968a226b9dade295d1412abd15de2895650' 
  AND token = 'HI2VTiUSbZfg8iSXR85IxM6S8CXiBGV6kyMD7Udod9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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