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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6433f8ed6b9a9c19237bcfb5884f57af5a1e3b68d1230f9896dbb621fb37c3' 
  AND token = 'VcWY0C+pnQfGtEpAsybx9tvTVOgCF782hkX4esK8zDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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