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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a16d3dba11a42b009c727622333c31a55ad525ea2f9c2387704505a4ed2ed1' 
  AND token = 'CPLndIhLS3+T1s+mEokUa2W3hT1L8HdGFYRO8KCh1+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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