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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecf6d4808e69b17c8c8fb41863cf6d22f8707f0968739120d6c0bee58251bca' 
  AND token = 'OAisS2qkjU4aVwmg3RpZx/JOSyWxYR5EfQW2gDV5qCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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