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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f797c6302c142982efaef9bc922ed4891a00aeb02b5cd186fa3266bbc3f769' 
  AND token = 'HEiMNud5iRBvUcch4NiaZStao7QCVhy2oUJHw4q7/Bc=' 
  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"
    }
  }
}