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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc25df85c7646ae151e50567627b393f39e0c17c19589b437e337e7719f4fd2' 
  AND token = '0JVW9Gz/E6eC5pBJz7FUXRqp/zsnhXfUuf52Xl7fYNk=' 
  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"
    }
  }
}