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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0224cef79a0e694b621ea3a66d8b9ea469ee95b389aea0acdf8a99d8f78619' 
  AND token = '9SMVVZV17x6ZbO+vJ6buAUmgeDcmuNG0RLOikpyAhk8=' 
  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"
    }
  }
}