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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9397ad7ac159ca2e1fe392584a53021d25530f3b94decb65137a8aa4f86455' 
  AND token = 'zmslf3n5bYIzKfWEiU9G15SH+yQUdnLRGJyYeE2Zrak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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