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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3bb9f00ea218ba2a817b7a5e663e37e488106aa4fc531ca624dd29c465dd63' 
  AND token = 'iuJeuhA3C68p622yINoqZOO/j9B3tVWyXudYqX2EH2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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