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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8ad3200612ac6c198313c8d6c231b96c07bd27f1f93787cbff3d8929f4f0d4' 
  AND token = 'XGnkI4AoRnOMHd3x2w9CLGATfeFP3HoycE+cePBSZps=' 
  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"
    }
  }
}