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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc3e5b869d24690451173dbbc24bf158e67bcb08b813a6d23a900d4fe79b6bc' 
  AND token = 'S3la5pQ6bhBZASO39F1CPmrUj+m169RvP8+xnYDxmRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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