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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ec220787b547c23a743456c7e4b223ae7d4fd05859a01070c1a40cda0ac88f' 
  AND token = 'nRVEm36cQWIBAVFO4EOnlhBHa+ZgKBvsGYsIQvvbiQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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