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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d320a39006a0e902764a3452e122ae8c679a3475aeb9af4a71ef141fabf66b' 
  AND token = 'qWjBjWVN5jb7dYmbD6E6nK6wccbJ4SYg4+Ye7/Tpjyw=' 
  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"
    }
  }
}