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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f099ac39ede5a7bd85825727171a13ce12028ef23b0907f2fbfa4116b8861b' 
  AND token = '9RZhS9IHb0Z3eU8g+w7Kve+1ZT46jXODx1MujeyiXYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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