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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2488e0e8e78f56e9da60fb9e8e67a838e95c630b1f5e3c39a85cfa4cae8c8619' 
  AND token = 'A4R7aWa2Ma97gGdbcfZiGN0oe45gYx3xJsBbv9FH5vA=' 
  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"
    }
  }
}