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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38156a3454bae0318990178fa83043c5aea36fc2664244690b39a6c8b20098e6' 
  AND token = 'KQ2oRY3sGOeBz9hlPkm2TlSSy6YNJi853Ynb6zXGOtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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