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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e427d9f95e34b4991f461a179f2cec796ea3408b3e68359a1f82c1a9a7f0f4' 
  AND token = 'xqBfZkPDibpBiw0QevcpNp9u9FSharv4V9Ii2uolk4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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