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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fc2e4b8471f8066f51db00f1fe29f6b340e473acfccffb5a959b5558c306e4' 
  AND token = '/D2CM+W1bTDAiQuqglYwGfmXD6HNOVY/pHnX/xFimlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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