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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899e6a77e0235d3e119ae9737d9d96b24c622b442f63bdabbe24a8e51f08bb33' 
  AND token = 'YkWor5Nx+GkIKmznpE2HZb6X9NZ02gVwdp0RXhXK1sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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