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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757633dadbf0c0a57aa65cfcd1dc01f36a18ed4a97b6b0a6c04709d6c8970491' 
  AND token = 'ymafj955I8nN5IPftDvlq/iIp4JEAJluUqLZ+N5kEhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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