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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6958338a0fd8d69bb2e7cd6e40034304738849391e0d4a03e231c1dd9ae7e623' 
  AND token = 'CDW+HVBdNlJk78N02EeA90Sxwk2WlUox8IMJrFxnh5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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