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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a54b54f8ad7ea2692111ef8758b52de6fd9b9762049cd833d0b2f898058f7b' 
  AND token = 'kWVFVwI4e7cUzcQ3YsseceFlds6gzfeT99XMh5WHa30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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