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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9108790562ab25e9a4033d3066319a38750b596410c1cf976b41853ae4147daa' 
  AND token = 'W4BIizODHSveYkXrYz6SyFMNecBOnLqLQtq+7KVqYDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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