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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e982af25a3c5f52c0599ba819c8b90ce3574815b608c5c35f587503cd29257b4' 
  AND token = 'utAM2SJemMgjM2INlZ9eJhmJ6gHN9xlpF/y5QoLTJzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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