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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34979020d22e3a1c248a2950b43524872cdbefc3aa2f3f8568e7c8be28562efa' 
  AND token = 'K3MMBUaw89AcC1JwTRyA/8lpP/FRveiws3GUhJustOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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