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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6470d8127eef47cbe731604f77a8c6ed2e78b315207f6ba3c49f8686e5125c6c' 
  AND token = '8hw1ckazaee0RQh0pjv6BTJ0tCJvxoNlk5EFVLZgjCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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