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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef4d82675917d7e08f57e9bbafde274a986e14d9b431e046d9b52b3107e9c8e' 
  AND token = 'jAVyuhexLyTvGv0kXqiFZPMXCn+Z9L3HZ8fmv6raPyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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