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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09aff083a32b5f0956e87d59198e17c583e6c26f4c861d918aa2a18dcea8c391' 
  AND token = 'CvHHTOUiodv2LH22A94DOUhjoey9xmnUEZb4vj2YgT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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