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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfe192df731aef3042ab1b062340063ab2b033c8ebbe439bd2c6e9d578222b0' 
  AND token = 'zOrNVO5eCFVIVnwLgHzPWsZidR4geWdAOb6NplVRGes=' 
  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"
    }
  }
}