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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74a94f9d97b5cdac46cf200caf4ae16c6a27f5f01a82e4aa5a3515d544d6e50' 
  AND token = '0KXgXpN97SPSrkDvBSK+iu8k+UM2tiwj0fg8ymMckcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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