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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcff1d189085f932b24b3f405a0f59825ae585cada3207590babb9e644998905' 
  AND token = 'fzOZc4l4wO/BHlEU3QzzC56pYlrbNw5XZJEK50LDM2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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