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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40f776e4aca54036eda26334d1dd3bb2967a1218b50d88570bc869602b5d5aa' 
  AND token = 'Al2+wCkfday+3uc5jVzBoamMQMPSWC9XSG2aTpbZFMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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