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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb26a9879cf95d548cc19bd23ed059c8e12a79a3b8d6194cd905feaf05093db' 
  AND token = 'wIzRq9QEaf40Dz0bCLryxDk6obfhT45wmPQIh5wsejM=' 
  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"
    }
  }
}