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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161bff3f3720fdf0009774fa8a10d276c1a61766cb1dd87aa2b63dc172ab8a28' 
  AND token = 'MOKtJO3B21ohzUr9LY0nft7IEpl9FTKjgmZ6SZZGAFk=' 
  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"
    }
  }
}