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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38adad9e0b32f1482bbe55b64212865095735bab52f0841e6efbfa390427e6b' 
  AND token = '6zeXhNmDuhp2eIKUz8Ql9gTEI26T74VTpYu3CYMYQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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