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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa8fa7b79f8c804ca51b3fd14a5a1241f3ad2fab9a7c3051f3c21639c1a0cee' 
  AND token = 'IDVHYcYkXa5mI617UEOCBUbWweDQut8pnc0RNcxxY3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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