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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c342407c9580f9ad07260b4b503fedd1b29b9cc2855499da8e6b643d06687da9' 
  AND token = '0EbnY6kCVqQa8O+5Mfg2rIU6Ew23C4UL4qwrFKn5H2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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