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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544be60372089d0a4f2bc42384aa6f1bbed6907cbcc9443d080bd50c9d3e7387' 
  AND token = 's6dtJ2hrvoVk7/pDwq2InF0X9l2dH3RvayLhIdHZjp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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