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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fca6fde498cb64b4a7166ca6e4c205b8500fd53db53781ac49781acccc7ea48' 
  AND token = 'WWrqY3kGR9xIbekiAFXDqGGXdRc0YWkhKeGnG14mclA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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