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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d35d4ab98ccf7a587275f8a087c5373a0d0d606db87eb8044a557eabad3bfcf' 
  AND token = 'eCPKMb/bvXZjIG9WRWnvKulBCl5of3H5LXhpDwal2hM=' 
  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"
    }
  }
}