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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c8326e308f5ca4dc4d719206aa11617ad52208797c40cb9fc8b062f7d6309b' 
  AND token = 'ti0AycwnCT/iIoyb+nIvZ7pUGTP9oKhw0XifuJJin2Q=' 
  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"
    }
  }
}